package com.lagou.rpc.consumer.proxy;

import com.alibaba.fastjson.JSON;
import com.lagou.rpc.common.RpcRequest;
import com.lagou.rpc.common.RpcResponse;
import com.lagou.rpc.consumer.client.RpcClient;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.UUID;

/**
 * 客户端代理类-创建代理对象
 * 1.封装request请求对象
 * 2.创建RpcClient对象
 * 3.发送消息
 * 4.返回结果
 */
@Component
public class RpcClientProxy {

    private static int index = 0;

    private final static int service_num = 3;

    private final static int[] ports = new int[]{8899,8900,8901};

    private synchronized static RpcClient getClient() {
        RpcClient rpcClient;
        rpcClient = new RpcClient("127.0.0.1", ports[index % service_num]);
        index++;
        return rpcClient;
    }

    public Object createProxy(Class serviceClass) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
            new Class[]{serviceClass}, new InvocationHandler() {
                @Override
                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                    //1.封装request请求对象
                    RpcRequest rpcRequest = new RpcRequest();
                    rpcRequest.setRequestId(UUID.randomUUID().toString());
                    rpcRequest.setClassName(method.getDeclaringClass().getName());
                    rpcRequest.setMethodName(method.getName());
                    rpcRequest.setParameterTypes(method.getParameterTypes());
                    rpcRequest.setParameters(args);
                    //2.创建RpcClient对象
                    RpcClient rpcClient = getClient();

                    try {
                        //3.发送消息
                        Object responseMsg = rpcClient.send(JSON.toJSONString(rpcRequest));
                        RpcResponse rpcResponse = JSON.parseObject(responseMsg.toString(), RpcResponse.class);
                        if (rpcResponse.getError() != null) {
                            throw new RuntimeException(rpcResponse.getError());
                        }
                        //4.返回结果
                        Object result = rpcResponse.getResult();
                        System.out.println(String.format("当前RPC-Client-Connect：%s:%d，结果：%s",
                                rpcClient.getIp(), rpcClient.getPort(), result.toString()));
                        return JSON.parseObject(result.toString(), method.getReturnType());
                    } catch (Exception e) {
                        throw e;
                    } finally {
                        rpcClient.close();
                    }

                }
            });
    }

}
